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4/5=r/5
We move all terms to the left:
4/5-(r/5)=0
We add all the numbers together, and all the variables
-(+r/5)+4/5=0
We get rid of parentheses
-r/5+4/5=0
We multiply all the terms by the denominator
-r+4=0
We add all the numbers together, and all the variables
-1r+4=0
We move all terms containing r to the left, all other terms to the right
-r=-4
r=-4/-1
r=+4
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